Apparatus and method for granting transmission resources for direct communication between user equipments in wireless communication system

ABSTRACT

A method is provided. The method is performed by a user equipment (UE), of performing sidelink communication, and includes obtaining a valid system information block (SIB) for sidelink communication, autonomously determining a sidelink resource based on information of a pool of sidelink resources included in the valid SIB for sidelink communication, and performing sidelink communication with another UE using the determined sidelink resource.

CROSS-REFERENCE TO RELATED APPLICATION

This application is based on and claims priority under 35 U.S.C. §119(a) of a Korean patent application number 10-2019-0003286, filed onJan. 10, 2019, in the Korean Intellectual Property Office, thedisclosure of which is incorporated by reference herein in its entirety.

BACKGROUND 1. Field

The disclosure relates to a wireless communication system. Moreparticularly, the disclosure relates to an apparatus and method forgranting radio resources to be used for packet transmission andreception using direct communication between user equipment (UE) in awireless communication system.

2. Description of the Related Art

To meet the soaring demand with respect to wireless data traffic sincecommercialization of 4^(th)-Generation (4G) communication systems,efforts have been made to develop improved 5^(th)-Generation (5G)communication systems or pre-5G communication systems. For this reason,5G communication systems or pre-5G communication systems are also calledbeyond-4G-network communication systems or post-long term evolution(LTE) systems.

It is considered that the 5G communication system will be implemented inmillimeter wave (mmWave) bands, e.g., 60 GHz bands, so as to accomplishhigher data rates. In 5G communication systems, beamforming, massivemulti-input multi-output (MIMO), full dimensional MIMO (FD-MIMO), arrayantenna, analog beamforming, and large-scale antenna technologies havebeen discussed as ways of alleviating propagation path loss andincreasing propagation distances in ultra-high frequency bands.

In order to improve system networks for 5G communication systems,various technologies have been developed, such as evolved small cell,advanced small cell, cloud radio access network (RAN), ultra-densenetwork, device to device (D2D) communication, wireless backhaul, movingnetwork, cooperative communication, coordinated multi-points (CoMPs),and interference cancellation.

For 5G systems, other technologies have been developed, such as, hybridfrequency-shift keying (FSK) and quadrature amplitude modulation (QAM)modulation (FQAM) and sliding window superposition coding (SWSC), whichare advanced coding modulation (ACM) schemes, and filter bank multicarrier (FBMC), non-orthogonal multiple access (NOMA), and sparse codemultiple access (SCMA), which are advanced access schemes.

Various schemes for determining radio resources in 5G systems are alsounder discussion. For example, a direct communication scheme for vehicleto everything (V2X) user equipment (UE) has been proposed. Moreover, indirect communication between UEs, there have been various discussionsabout shortening a communication time, improving reliability, andefficiently performing direct communication between UEs.

The above information is presented as background information only toassist with an understanding of the disclosure. No determination hasbeen made, and no assertion is made, as to whether any of the abovemight be applicable as prior art with regard to the disclosure.

SUMMARY

Aspects of the disclosure are to address at least the above-mentionedproblems and/or disadvantages and to provide at least the advantagesdescribed below. Accordingly, an aspect of the disclosure is to providean apparatus and method for supporting a vehicle communication serviceand data transmission, in which required values for high reliability andlow latency are achieved by providing a method performed using a directcommunication scheme between UEs in a vehicle communication system.

Another aspect of the disclosure, in a next-generation radio accessnetwork (ng-RAN) (gNodeB (gNB)) connected to a 5G core network or anevolved universal mobile telecommunication system (UMTS) terrestrialradio access network (E-UTRAN) (ng-evolved NB: ng-eNB) connected to the5G core network, a UE may perform a V2X service through the ng-RAN orthe E-UTRAN.

In accordance with another aspect of the disclosure, when a base station(ng-RAN or ng-eNB) is connected to an evolved packet core network (EPC),the UE may perform the V2X service through the base station. Accordingto another embodiment of the disclosure, when a base station (eNB) isconnected to the EPC, the UE may perform the V2X service through thebase station. In this case, a V2X wireless interface communicationscheme available for direct communication between UEs may include atleast one of a unicast scheme, a groupcast scheme, or a broadcastscheme, and the disclosed embodiment provides a method of granting radioresources to be used for V2X transmission and reception in eachcommunication scheme.

Additional aspects will be set forth in part in the description whichfollows and, in part, will be apparent from the description, or may belearned by practice of the presented embodiments of the disclosure.

In accordance with another aspect of the disclosure, a method, performedby a user equipment (UE), of performing sidelink communication includesobtaining a valid system information block (SIB) for sidelinkcommunication, autonomously determining a sidelink resource based oninformation of a pool of sidelink resources included in the valid SIBfor sidelink communication, and performing sidelink communication withanother UE using the determined sidelink resource.

Other aspects, advantages, and salient features of the disclosure willbecome apparent to those skilled in the art from the following detaileddescription, which, taken in conjunction with the annexed drawings,discloses various embodiments of the disclosure.

BRIEF DESCRIPTION OF THE DRAWINGS

The above and other aspects, features, and advantages of certainembodiments of the disclosure will be more apparent from the followingdescription taken in conjunction with the accompanying drawings, inwhich:

FIG. 1 illustrates a wireless communication system according to anembodiment of the disclosure;

FIG. 2 is a block diagram of a base station in a wireless communicationsystem according to an embodiment of the disclosure;

FIG. 3 is a block diagram of a user equipment (UE) in a wirelesscommunication system according to an embodiment of the disclosure;

FIG. 4A illustrates a structure of a communicator in a wirelesscommunication system according to an embodiment of the disclosure;

FIG. 4B illustrates another structure of a communicator in a wirelesscommunication system according to an embodiment of the disclosure;

FIG. 4C illustrates another structure of a communicator in a wirelesscommunication system according to an embodiment of the disclosure;

FIG. 5A illustrates a situation where direct communication between UEsis performed using sidelink radio access technology (RAT), according toan embodiment of the disclosure;

FIG. 5B illustrates another situation where direct communication betweenUEs is performed using sidelink radio access technology (RAT), accordingto an embodiment of the disclosure;

FIG. 5C illustrates another situation where direct communication betweenUEs is performed using sidelink radio access technology (RAT), accordingto an embodiment of the disclosure;

FIG. 5D illustrates another situation where direct communication betweenUEs is performed using sidelink radio access technology (RAT), accordingto an embodiment of the disclosure;

FIG. 6A illustrates a signal procedure in a sidelink resource grant mode1 for direct communication between UEs, according to an embodiment ofthe disclosure;

FIG. 6B illustrates another signal procedure in a sidelink resourcegrant mode 1 for direct communication between UEs, according to anembodiment of the disclosure;

FIG. 6C illustrates another signal procedure in a sidelink resourcegrant mode 1 for direct communication between UEs, according to anembodiment of the disclosure;

FIG. 6D illustrates another signal procedure in a sidelink resourcegrant mode 1 for direct communication between UEs, according to anembodiment of the disclosure;

FIG. 6E illustrates another signal procedure in a sidelink resourcegrant mode 1 for direct communication between UEs, according to anembodiment of the disclosure;

FIG. 7A illustrates a signal procedure in a sidelink resource grant mode2a for direct communication between UEs, according to an embodiment ofthe disclosure;

FIG. 7B illustrates another signal procedure in a sidelink resourcegrant mode 2a for direct communication between UEs, according to anembodiment of the disclosure;

FIG. 8A illustrates a signal procedure in a sidelink resource grant mode2c for direct communication between UEs, according to an embodiment ofthe disclosure;

FIG. 8B illustrates another signal procedure in a sidelink resourcegrant mode 2c for direct communication between UEs, according to anembodiment of the disclosure;

FIG. 8C illustrates another signal procedure in a sidelink resourcegrant mode 2c for direct communication between UEs, according to anembodiment of the disclosure;

FIG. 8D illustrates another signal procedure in a sidelink resourcegrant mode 2c for direct communication between UEs, according to anembodiment of the disclosure;

FIG. 9A illustrates a signal procedure in a sidelink resource grant mode2d for direct communication between UEs, according to an embodiment ofthe disclosure;

FIG. 9B illustrates another signal procedure in a sidelink resourcegrant mode 2d for direct communication between UEs, according to anembodiment of the disclosure;

FIG. 10A illustrates a signal procedure in a sidelink resource grantmode 2b for direct communication between UEs, according to an embodimentof the disclosure;

FIG. 10B illustrates another signal procedure in a sidelink resourcegrant mode 2b for direct communication between UEs, according to anembodiment of the disclosure;

FIG. 11A illustrates a signal procedure for operating sidelink resourceconfiguration information for direct communication between UEs,according to an embodiment of the disclosure;

FIG. 11B illustrates another signal procedure for operating sidelinkresource configuration information for direct communication between UEs,according to an embodiment of the disclosure;

FIG. 11C illustrates another signal procedure for operating sidelinkresource configuration information for direct communication between UEs,according to an embodiment of the disclosure; and

FIG. 11D illustrates another signal procedure for operating sidelinkresource configuration information for direct communication between UEs,according to an embodiment of the disclosure.

The same reference numerals are used to represent the same elementsthroughout the drawings.

DETAILED DESCRIPTION

The following description with reference to the accompanying drawings isprovided to assist in a comprehensive understanding of variousembodiments of the disclosure as defined by the claims and theirequivalents. It includes various specific details to assist in thatunderstanding, but these are to be regarded as merely exemplary.Accordingly, those of ordinary skill in the art will recognize thatvarious changes and modifications of the various embodiments describedherein can be made without departing from the scope and spirit of thedisclosure. In addition, descriptions of well-known functions andconstructions may be omitted for clarity and conciseness.

The terms and words used in the following description and claims are notlimited to the bibliographical meanings, but are merely used by theinventor to enable a clear and consistent understanding of thedisclosure. Accordingly, it should be apparent to those skilled in theart that the following description of various embodiments of thedisclosure is provided for illustration purposes only and not for thepurpose of limiting the disclosure as defined by the appended claims andtheir equivalents.

It is to be understood that a singular form of a noun corresponding toan item may include one or more of the things, unless the relevantcontext clearly indicates otherwise. All of the terms used hereinincluding technical or scientific terms have the same meanings as thosegenerally understood by an ordinary skilled person in the related art.The terms defined in a generally used dictionary should be interpretedas having meanings that are the same as or similar with the contextualmeanings of the relevant technology and should not be interpreted ashaving ideal or exaggerated meanings unless they are clearly defined inthe various embodiments of the disclosure. Depending on a case, termsdefined in the disclosure cannot be analyzed to exclude the variousembodiments of the disclosure.

Throughout the disclosure, the expression “at least one of a, b or c”indicates only a, only b, only c, both a and b, both a and c, both b andc, all of a, b, and c, or variations thereof.

A terminal may include a user equipment (UE), a mobile station (MS), acellular phone, a smartphone, a computer, or a multimedia system capableof performing communication functions.

In the disclosure, a controller may be referred to as a processor.

In the disclosure, a layer (layer device) may be referred to as anentity.

In various embodiments of the disclosure described below, ahardware-based access method will be described as an example. However,various embodiments of the disclosure include a technique using bothhardware and software, such that the various embodiments of thedisclosure do not exclude a software-based access method.

The disclosure relates to an apparatus and method for determining radioresources in a wireless communication system. More specifically, thedisclosure presents a description of a technique capable of satisfying aquality of service (QoS) level required for various V2X services basedon a sidelink radio resource grant method for sidelink directcommunication between vehicle-to-everything (V2X) UEs in a wirelesscommunication system.

As used below, a term indicating a signal, a term indicating a channel,a term indicating control information, a term indicating networkentities, a term indicating a component of an apparatus, etc., will bepresented for convenience of description. However, the disclosure is notlimited by the following terms, and other terms having equivalenttechnical meanings may be used.

Although the disclosure will be described with reference to variousembodiments thereof by using terms used in some communication standards(e.g., the 3^(rd) Generation Partnership Project: 3GPP), those aremerely examples used for description. Various embodiments of thedisclosure may be easily modified for application to other communicationsystems.

FIG. 1 illustrates a wireless communication system according to anembodiment of the disclosure.

Referring to FIG. 1, a base station (BS) 110, a UE 120, and a UE 130 areillustrated as nodes using a wireless channel in a wirelesscommunication system. While FIG. 1 shows one BS 110, another BS that isthe same as or similar to the BS 110 may be further included in thewireless communication system. In addition, while FIG. 1 shows two UEs120 and 130, another UE that is the same as or similar to the UEs 120and 130 may be further included in the wireless communication system.

The BS 110 may be a network infrastructure that provides the UEs 120 and130 with a radio access. The BS 110 may have a coverage defined as ageographic region based on a distance in which signaltransmission/reception is possible. The BS 110 may be referred to as notonly the ‘BS’, but also an ‘access point (AP)’, an ‘evolved NodeB(eNB)’, a ‘5^(th)-generation (5G) node’, a ‘5G NodeB (gNodeB or gNB)’, a‘wireless point’, a ‘transmission/reception point (TRP)’, or other termshaving technical meanings equivalent thereto.

Each of the UEs 120 and 130 is a device used by a user, and may performcommunication with the BS 110 through a wireless channel. Depending on acase, at least one of the UEs 120 and 130 may operate regardless of auser's intervention. That is, at least one of the UEs 120 and 130 may bea device performing machine type communication (MTC), and thus may notbe carried by the user. Each of the UEs 120 and 130 may be referred toas not only a ‘UE’, but also a ‘terminal’, a ‘mobile station (MS)’, a‘subscriber station (SS)’, a ‘remote terminal’, a ‘wireless terminal’, a‘user device’, or other terms having technical meanings equivalentthereto.

The BS 110, the UE 120, and the UE 130 may transmit and receive a radiofrequency (RF) signal in a sub 6 GHz band and a millimeter wave (mmWave)band (e.g., 28 GHz, 30 GHz, 38 GHz, or 60 GHz). In this case, to improvea channel gain, the BS 110, the UE 120, and the UE 130 may performbeamforming. Beamforming may include transmission beamforming andreception beamforming. That is, the BS 110, the UE 120, and the UE 130may give directivity to a transmission signal or a reception signal. Tothis end, the BS 110 and the UEs 120 and 130 may select serving beams112, 113, 121, and 131 through a beam search procedure or a beammanagement procedure. After the serving beams 112, 113, 121, and 131 areselected, communication may be performed using resources having a quasico-location (QLC) relationship with resources used for transmission ofthe serving beams 112, 113, 121, and 131.

When large-scale properties of a channel carrying a symbol on a firstantenna port may be inferred from a channel carrying a symbol on asecond antenna port, the first antenna port and the second antenna portmay be evaluated as having a QCL relationship with each other. Forexample, the large-scale properties of the channel may include at leastone of delay spread, Doppler spread, a Doppler shift, an average gain,an average delay, or a spatial receiver parameter.

FIG. 2 is a block diagram of a base station in a wireless communicationsystem according to an embodiment of the disclosure. A configurationillustrated in FIG. 2 may be understood as a configuration of the BS110. The term used below such as ‘unit’, ‘module’, or the like indicatesa unit for processing at least one function or operation, and may beimplemented in hardware, software, or in a combination of hardware andsoftware.

Referring to FIG. 2, the BS 110 may include a wireless communicator 210,a backhaul communicator 220, a storage 230, and a controller 240.

The wireless communicator 210 may perform functions for transmitting andreceiving a signal through a wireless channel. For example, the wirelesscommunicator 210 may perform conversion between a baseband signal and abitstream according to physical layer standards of a system. In datatransmission, the wireless communicator 210 may generate complex symbolsby encoding and modulating a transmission bitstream. In data reception,the wireless communicator 210 may recover a received bitstream bydemodulating and decoding a baseband signal.

The wireless communicator 210 may also up-convert a baseband signal intoa radio frequency (RF) band signal, transmit the RF band signal throughan antenna, and down-convert an RF band signal received through theantenna into a baseband signal. To this end, the wireless communicator210 may include a transmission filter, a reception filter, an amplifier,a mixer, an oscillator, a digital-to-analog converter (DAC), ananalog-to-digital converter (ADC), and so forth. The wirelesscommunicator 210 may also include multiple transmission/reception paths.The wireless communicator 210 may further include at least one antennaarray including multiple antenna elements.

In terms of hardware, the wireless communicator 210 may include adigital unit and an analog unit, in which the analog unit may includemultiple sub-units depending on operating power, operating frequency,etc. The digital unit may be implemented with at least one processor(e.g., a digital processor: DSP).

The wireless communicator 210 may transmit and receive a signal asdescribed above. Thus, the entire wireless communicator 210 or a partthereof may be referred to as a ‘transmitter’, a ‘receiver’, or a‘transceiver’. In addition, in the following description, transmissionand reception performed through a wireless channel may include a meaningof the above-described processing performed by the wireless communicator210.

The backhaul communicator 220 may provide an interface for performingcommunication with other nodes in a network. The backhaul communicator220 may convert a bitstream transmitted from a BS to another node, e.g.,another access node, another BS, a high-layer node, a core network,etc., into a physical signal, and convert a physical signal receivedfrom another node into a bitstream.

The storage 230 may store data such as a basic program for operations ofthe BS 110, an application program, configuration information, and soforth. The storage 230 may include a volatile memory, a non-volatilememory, a combination of the volatile memory and the non-volatilememory, and/or the like. The storage 230 may provide stored data at therequest of the controller 240.

The controller 240 may control overall operations of the BS 110. Forexample, the controller 240 may transmit and receive a signal throughthe wireless communicator 210 or the backhaul communicator 220. Thecontroller 240 may record and read data from and in the storage 230. Thecontroller 240 may perform functions of a protocol stack required in thecommunication standards. According to another implementation example,the protocol stack may be included in the wireless communicator 210. Tothis end, the controller 240 may include at least one processor.

According to various embodiments of the disclosure, the controller 240may transmit radio resource control (RRC) configuration information to aUE 120 or 130. The controller 240 may transmit sidelink configurationinformation to the UE 120 or 130. For example, the controller 240 maycontrol the BS 110 to perform operations according to variousembodiments of the disclosure described below.

FIG. 3 is a block diagram of a user equipment (UE) in a wirelesscommunication system according to an embodiment of the disclosure. Aconfiguration illustrated in FIG. 3 may be understood as a configurationof the UE 120 or 130. The term used below such as ‘unit’, ‘module’, orthe like indicates a unit for processing at least one function oroperation, and may be implemented in hardware, software, or in acombination of hardware and software.

Referring to FIG. 3, the UE may include a communicator 310, a storage320, and a controller 330.

The communicator 310 may perform functions for transmitting andreceiving a signal through a wireless channel. For example, thecommunicator 310 may perform conversion between a baseband signal and abitstream according to physical layer standards of a system. In datatransmission, the communicator 310 may generate complex symbols byencoding and modulating a transmission bitstream. In data reception, thecommunicator 310 may recover a received bitstream by demodulating anddecoding a baseband signal. The communicator 310 may also up-convert abaseband signal into an RF band signal, transmit the RF band signalthrough an antenna, and down-convert an RF band signal received throughthe antenna into a baseband signal. The communicator 310 may include atransmission filter, a reception filter, an amplifier, a mixer, anoscillator, a DAC, an ADC, and so forth.

The communicator 310 may also include multiple transmission/receptionpaths. The communicator 310 may include at least one antenna arrayincluding multiple antenna elements. In terms of hardware, thecommunicator 310 may include a digital circuit and an analog circuit(e.g., a radio frequency integrated circuit: RFIC). Herein, the digitalcircuit and the analog circuit may be implemented with one package. Thecommunicator 310 may include multiple RF chains. Moreover, thecommunicator 310 may perform beamforming.

In addition, the communicator 310 may include multiple communicationmodules for processing signals in different frequency bands. Moreover,the communicator 310 may include multiple communication modules forsupporting multiple different RATs. For example, the different RATs mayinclude Bluetooth low energy (BLE), WiFi, WiFi gigabyte (WiGig), acellular network (e.g., Long Term Evolution (LTE)), etc. The differentfrequency bands may include a super high frequency (SHF) (e.g., 2.5 GHz,3.5 GHz, 5 GHz) band, and an mm waves (millimeter wave) (e.g., 60 GHz)band.

The communicator 310 may transmit and receive a signal as describedabove. Thus, the entire communicator 310 or a part thereof may bereferred to as a ‘transmitter’, a ‘receiver’, or a ‘transceiver’. Inaddition, in the following description, transmission and receptionperformed through a wireless channel may include a meaning of theabove-described processing performed by the communicator 310.

The storage 320 may store data such as a basic program for operations ofthe UE, an application program, configuration information, and so forth.The storage 320 may include a volatile memory, a non-volatile memory, acombination of the volatile memory and the non-volatile memory, and/orthe like. The storage 320 may provide stored data at the request of thecontroller 330.

The controller 330 may control overall operations of the UE. Forexample, the controller 330 may transmit and receive a signal throughthe communicator 310. The controller 330 may record and read data fromand in the storage 320. The controller 330 may perform functions of aprotocol stack required in the communication standards. For this, thecontroller 330 may include at least one processor or microprocessor, ormay be implemented as a part of a processor. A part of the communicator310 and the controller 330 may be referred to as a communicationprocessor (CP).

According to various embodiments of the disclosure, when the UE 120performs sidelink direct communication with another UE, the UE 120 mayperform a process of identifying service information required by a V2Xapplication and determining a V2X transmission mode (unicast, groupcast,or broadcast), a process of determining a sidelink resource grant mode(BS scheduling or UE scheduling) required for V2X packet transmission, aprocess of determining a sidelink resource grant mode (BS scheduling orUE scheduling) required for hybrid automatic repeat request (HARQ)feedback transmission for a V2X packet, a process of performing sidelinktransmission resource or HARQ feedback transmission resource grant in aBS scheduling mode, a process of performing sidelink transmissionresource or HARQ feedback transmission resource grant in a UE schedulingmode, a process of performing configured grant-based sidelink resourcegrant in the UE scheduling mode, a process of performing a scheduling UEoperation for performing sidelink resource grant of another UE in the UEscheduling mode, and a process of performing an assistant UE operationfor assisting sidelink resource grant of another UE in the UE schedulingmode. For example, the controller 330 may control the UE to performoperations according to various embodiments of the disclosure describedbelow.

FIGS. 4A through 4C illustrate structures of a communicator in awireless communication system according to various embodiments of thedisclosure. FIGS. 4A through 4C illustrate an example of a detailedstructure of the wireless communicator 210 of FIG. 2 or the communicator310 of FIG. 3. More specifically, FIGS. 4A through 4C illustratecomponents for performing beamforming, as a part of the wirelesscommunicator 210 of FIG. 2 or the communicator 310 of FIG. 3.

Referring to FIG. 4A, the wireless communicator 210 or the communicator310 may include an encoder and modulator 402, a digital beamformer 404,multiple transmission paths 406-1 through 406-N, and an analogbeamformer 408.

The encoder and modulator 402 may perform channel encoding. For channelencoding, at least one of a low density parity check (LDPC) code, aconvolutional code, or a polar code may be used. The encoder andmodulator 402 may generate modulation symbols by performingconstellation mapping.

The digital beamformer 404 may perform beamforming with respect to adigital signal (e.g., modulation symbols). To this end, the digitalbeamformer 404 may multiply modulation symbols by beamforming weightvalues. The beamforming weight values may be used to convert anamplitude and a phase of a signal, and may be referred to as a‘precoding matrix’, a ‘precoder’, etc. The digital beamformer 404 mayoutput the digital-beamformed modulation symbols to the multiple paths406-1 through 406-N. In this case, according to a multiple-inputmultiple-output (MIMO) transmission scheme, the modulation symbols maybe multiplexed or the same modulation symbols may be provided to themultiple transmission paths 406-1 through 406-N.

The multiple transmission paths 406-1 through 406-N may convert thedigital-beamformed digital signals into an analog signal. To this end,each of the multiple transmission paths 406-1 through 406-N may includean inverse fast Fourier transform (IFFT) operator, a cyclic prefix (CP)inserter, a digital-to-analog converter (DAC), and an up-converter. TheCP inserter is for an orthogonal frequency division multiplexing (OFDM)scheme, and may be excluded when another physical layer scheme (e.g.,filter bank multi-carrier: FBMC) is applied. The multiple transmissionpaths 406-1 through 406-N may provide an independent signal processingprocess for multiple streams generated through digital beamforming.However, depending on an implementation scheme, some of the componentsof the multiple transmission paths 406-1 through 406-N may be used incommon.

The analog beamformer 408 may perform beamforming with respect to ananalog signal. To this end, the analog beamformer 408 may multiplyanalog symbols by beamforming weight values. The beamforming weightvalues may be used to convert an amplitude and a phase of a signal.According to a connection structure between the multiple transmissionpaths 406-1 through 406-N and antennas, the analog beamformer 408 may bestructured as shown in FIG. 4B or 4C.

Referring to FIG. 4B, signals input to the analog beamformer 408 may betransmitted through the antennas, after passing through phase/amplitudeconversion and an amplification operation. In this case, a signal ofeach path may be transmitted through different antenna sets, i.e.,antenna arrays. In case of processing of a signal input through thefirst path, the signal may be converted into a signal sequence havingdifferent phases/amplitudes or the same phase/amplitude byphase/amplitude converters 412-1-1 through 412-1-M, may be amplified byamplifiers 414-1-1 through 414-1-M, and may then be transmitted throughthe antennas.

Referring to FIG. 4C, signals input to the analog beamformer 408 may betransmitted through the antennas, after passing through phase/amplitudeconversion and an amplification operation. In this case, a signal ofeach path may be transmitted through the same antenna set, i.e., thesame antenna array. In case of processing of a signal input through thefirst path, the signal may be converted into a signal sequence havingdifferent phases/amplitudes or the same phase/amplitude by thephase/amplitude converters 412-1-1 through 412-N-M, and may be amplifiedby the amplifiers 414-1-1 through 414-N-M. For transmission through oneantenna array, the amplified signals may be summed by summers 416-1through 416-M based on an antenna element, and may then be transmittedthrough the antennas.

FIG. 4B illustrates an example in which an independent antenna array isused for each transmission path, and FIG. 4C illustrates an example inwhich transmission paths share one antenna array. However, the structureof the analog beamformer 408 is not limited to the embodiment shown inFIGS. 4B and 4C, and according to another embodiment of the disclosure,some transmission paths may have an independent antenna array and theother transmission paths may share one antenna array. According toanother embodiment of the disclosure, by applying a switchable structurebetween transmission paths and antenna arrays as the structure of theanalog beamformer 408, a structure that is changeable adaptively to acircumstance may be used.

The V2X service may be divided into a basic safety service and anadvanced service. The basic safety service may include detailed servicessuch as a vehicle notification (CAM or BSM) service, a left-turnnotification service, a forward collision warning system, an emergencyvehicle access notification service, a forward obstacle warning service,an intersection signal information service, etc., and V2X informationmay be transmitted and received using broadcast, unicast, or groupcasttransmission. The advanced service reinforces QoS requirements whencompared to the basic safety service, and requires a scheme fortransmitting and receiving V2X information by using broadcast, unicast,or groupcast transmission to transmit and receive V2X information in aparticular vehicle group or between two vehicles. The advanced servicemay include detailed services such as a platoon driving service, anautonomous driving service, a remote driving service, an extendedsensor-based V2X service, etc. According to various embodiments of thedisclosure, a description will be made of a scheme to select RATresources for performing direct communication between vehicles requiredin the basic safety service or the advanced service, that is, sidelinkresources needed for V2X packet transmission and sidelink resourcesneeded for HARQ feedback transmission.

The methods according to the embodiments of the disclosure described inthe claims or specification of the disclosure may be implemented byhardware, software, or a combination thereof.

When the methods are implemented by software, a computer-readablestorage medium having stored therein one or more programs (softwaremodules) may be provided. The one or more programs stored in thecomputer-readable storage medium may be configured for execution by oneor more processors in an electronic device. The one or more programsinclude instructions that cause the electronic device to execute themethods according to the embodiments described in the claims or thespecification of the disclosure.

These programs (software modules and software) may be stored in randomaccess memories (RAMs), non-volatile memories including flash memories,read only memories (ROMs), electrically erasable programmable ROMs(EEPROMs), magnetic disc storage devices, compact disc-ROMs (CD-ROMs),digital versatile discs (DVDs), other types of optical storage devices,or magnetic cassettes. The programs may be stored in a memory configuredby a combination of some or all of such storage devices. Also, each ofthe memories may be provided in plurality.

The programs may be stored to an attachable storage device of theelectronic device accessible via the communication network such asInternet, Intranet, a local area network (LAN), a wide area network(WAN), or storage area network (SAN), or a communication network bycombining the networks. The storage device may access a deviceperforming the embodiment of the disclosure through an external port. Inaddition, a separate storage device on a communication network mayaccess a device performing an embodiment of the disclosure.

In the above-described detailed embodiments of the disclosure,components included in the disclosure have been expressed as singular orplural according to the provided detailed embodiments of the disclosure.However, singular or plural expressions have been selected properly fora condition provided for convenience of a description, and thedisclosure is not limited to singular or plural components andcomponents expressed as plural may be configured as a single componentor a component expressed as singular may also be configured as pluralcomponents.

FIGS. 5A through 5C illustrate a situation where direct communicationbetween UEs is performed using sidelink radio access technology (RAT),according to various embodiments of the disclosure.

FIG. 5A illustrates a scenario in which UEs in a gNB coverage performdirect communication.

Referring to FIG. 5A, sidelink resource pool (transmission/receptionpool) information to be used for unicast-based V2X packettransmission/reception between the UEs in the gNB coverage may betransmitted through a system information message or RRC dedicatedmessage of a gNB or may be pre-configured. In addition to the sidelinkresource pool to be used for unicast-based V2X packet transmission andreception between the UEs, a sidelink resource pool to be used for HARQfeedback transmission may be separately configured or may be configuredidentically to the V2X packet transmission/reception pool.

Referring to FIG. 5A, sidelink resource pool (transmission/receptionpool) information to be used for broadcast-based V2X packettransmission/reception may be transmitted through the system informationmessage or RRC dedicated message of the gNB or may be pre-configured.

FIG. 5B illustrates a scenario in which UEs in a ng-eNB coverage performdirect communication.

Referring to FIG. 5B, sidelink resource pool (transmission/receptionpool) information to be used for unicast-based V2X packettransmission/reception between the UEs in the ng-eNB coverage may betransmitted through a system information message or RRC dedicatedmessage of an ng-eNB or may be pre-configured. In addition to thesidelink resource pool to be used for unicast-based V2X packettransmission and reception between the UEs, a sidelink resource pool tobe used for HARQ feedback transmission may be separately configured ormay be configured identically to the V2X packet transmission/receptionpool.

Referring to FIG. 5B, sidelink resource pool (transmission/receptionpool) information to be used for broadcast-based V2X packettransmission/reception may be transmitted through the system informationmessage or RRC dedicated message of the ng-eNB or may be pre-configured.

FIG. 5C illustrates a scenario in which a UE in a gNB coverage and a UEin an eNB coverage perform direct communication. Sidelink resource pool(transmission/reception pool) information to be used for unicast-basedV2X packet transmission/reception between the UE in the gNB coverage andthe UE in the eNB coverage may be transmitted through a systeminformation message or RRC dedicated message of an ng-eNB or may bepre-configured. In addition to the sidelink resource pool to be used forunicast-based V2X packet transmission and reception between the UE inthe gNB coverage and the UE in the eNB coverage, a sidelink resourcepool to be used for HARQ feedback transmission may be separatelyconfigured or may be configured identically to the V2X packettransmission/reception pool.

Referring to FIG. 5C, sidelink resource pool (transmission/receptionpool) information to be used for broadcast-based V2X packettransmission/reception may be transmitted through the system informationmessage or RRC dedicated message of the gNB or may be pre-configured.

In a sidelink resource grant scheme according to an embodiment of thedisclosure, in a scheduling mode where a UE located in the gNB coverageplays a role of a scheduling UE or an assistant UE, the UE may belocated in the gNB coverage and obtain sidelink pool information (whichmay include an HARQ feedback resource according to an embodiment of thedisclosure) or pre-configured sidelink resource pool information, andplay a role of a scheduling UE or an assistant UE by using the obtainedpool information. In a sidelink resource grant scheme according toanother embodiment of the disclosure, in a scheduling mode where a UElocated in the eNB coverage plays a role of a scheduling UE or anassistant UE, the UE may be located in the eNB coverage and obtainpre-configured sidelink resource pool information and play a role of ascheduling UE or an assistant UE by using the obtained pool information.

FIG. 5D illustrates a scenario in which UEs in an eNB coverage performdirect communication. Sidelink resource pool (transmission/receptionpool) information to be used for unicast-based V2X packettransmission/reception between the UEs in the eNB coverage may bepre-configured. In addition to the sidelink resource pool to be used forunicast-based V2X packet transmission and reception between the UEs inthe eNB coverage, a sidelink resource pool to be used for HARQ feedbacktransmission may be separately configured or may be configuredidentically to the V2X packet transmission/reception pool.

Referring to FIG. 5D, sidelink resource pool (transmission/receptionpool) information to be used for broadcast-based V2X packettransmission/reception may be pre-configured. In a sidelink resourcegrant scheme according to an embodiment of the disclosure, in ascheduling mode where a UE located in the eNB coverage plays a role of ascheduling UE or an assistant UE, the UE obtain pre-configured sidelinkresource pool information and play a role of a scheduling UE or anassistant UE by using the obtained pool information.

In FIGS. 5A through 5D, a broadcast pool and a unicast pool may beconfigured as the same pool or different pools. According to anembodiment of the disclosure, a criterion for configuring the broadcastpool and the unicast pool as the same pool or separate pools may be, forexample, a case where a congestion ratio of a pool exceeds a threshold.A V2X server or a BS may manage a threshold for a congestion ratio of apool corresponding to each V2X service and provide the V2X service, andwhen the congestion ratio of the pool exceeds the threshold, thebroadcast and the unicast may be managed in the separate pools.

According to various embodiments of the disclosure, a method forsidelink resource grant for direct communication between UEs may be usedfor unicast-based V2X message transmission/reception and broadcast-basedV2X message transmission/reception. According to various embodiments ofthe disclosure, a method for sidelink resource grant for directcommunication between UEs may include a mode in which a BS directlygrants a resource and a mode in which a UE directly selects a resource.

According to various embodiments of the disclosure, for unicast-basedV2X packet transmission/reception, a reception UE may transmit an HARQfeedback with respect to a V2X packet. When a UE is located in the gNBcoverage or the ng-eNB coverage, the UE may transmit a request for asidelink resource for transmitting the HARQ feedback to the gNB or theng-eNB. The UE transmitting the request for the sidelink resource fortransmitting the HARQ feedback may include at least one of a UEtransmitting a unicast-based V2X packet, a UE having received aunicast-based V2X packet, a scheduling UE, or an assistant UE. Signalingused by the UE to transmit a request for resources needed for HARQfeedback transmission may include at least one of an RRC dedicatedmessage (SidelinkUEInformation or UEAsssitanceInformation) or MACcontrol signaling (HARQ feedback resource request MAC CE). The gNB orthe ng-eNB having received the request may provide HARQ feedbacktransmission resource information to the UE through an RRC dedicatedmessage (RRCConnectionReconfiguration). The HARQ feedback transmissionresource information provided by the gNB or the ng-eNB may include atleast one of a (mode1-based) HARQ feedback transmission resource to bescheduled directly by the gNB or the ng-eNB or a (mode2-based) HARQfeedback transmission resource to be selected by the UE. A procedure forgranting a sidelink resource for HARQ feedback transmission will bedescribed in detail with reference to FIGS. 6 through 10.

FIGS. 6A through 6E illustrate a signal procedure in a sidelink resourcegrant mode 1 for direct communication between UEs, according to variousembodiments of the disclosure.

FIGS. 6A through 6C illustrate a procedure using SidelinkUEInformationsignaling exchange according to various embodiments of the disclosure.In case that the UE transmits a SidelinkUEInformation message to the BSto request sidelink (SL) resources (including a V2X packet and an HARQfeedback), this case may include a case where the UE receives a Systeminformation message (e.g., sibTypeV2X) including information indicatingthat the BS supports a V2X sidelink function. In an embodiment of FIGS.6A through 6C, it may be assumed that UE1 is a transmission (TX) UE andUE2 is a reception (RX) UE. When unicast-based V2X packettransmission/reception is performed, the RX UE may transmit an HARQfeedback with respect to a V2X packet.

Referring to FIG. 6A, according to an embodiment of the disclosure, inoperation 601, UE1 may transmit a SidelinkUEInformation messageincluding information needed to request an SL resource necessary for V2Xpacket transmission to a BS. In operation 603, the BS may configure asidelink transmission resource or SL resource to be used by UE1 fordirect communication, based on information of UE1, and transmit anRRCConnectionReconfiguration message including the configured sidelinktransmission resource to UE1. According to sidelink transmissionresource grant information included in the RRCConnectionReconfigurationmessage received by the UE in operation 603, when a sidelink resourcegrant mode for direct communication between UEs is determined as mode1where the BS directly schedules a sidelink resource and the UE isconfigured to request dynamic grant, then UE1 may transmit SL-BSRsignaling to the BS to be dynamically granted with the sidelinktransmission resource, in operation 605. In operation 607, the BS maydynamically grant the sidelink resource to be used for V2X packettransmission by UE1, based on information of SL-BSR signalingtransmitted by UE1.

In an embodiment of the disclosure where UE1 and UE2 transmit andreceive a V2X packet in the unicast manner, UE2 may transmit an HARQfeedback with respect to the V2X packet transmitted by UE1. In operation609, to be granted with a sidelink resource for HARQ feedbacktransmission, UE2 may transmit a SidelinkUEInformation message includinginformation needed for HARQ feedback transmission resource grant to theBS. In operation 611, the BS may configure a sidelink transmissionresource to be used by UE2 for HARQ feedback transmission, based oninformation of UE2, and transmit an RRCConnectionReconfiguration messageincluding the configured sidelink transmission resource to UE2. When theBS determines to directly schedule an HARQ feedback transmissionresource according to sidelink resource grant information used for theHARQ feedback, included in the RRCConnectionReconfiguration messagereceived in operation 611, then UE2 may be granted with a sidelinkresource to be used for HARQ feedback transmission from the BS inoperation 613.

Referring to FIG. 6B, according to an embodiment of the disclosure, inoperation 621, UE1 may transmit a SidelinkUEInformation messageincluding information needed to request a sidelink resource necessaryfor V2X packet transmission to the BS. In operation 623, the BS mayconfigure a sidelink transmission resource to be used by UE1 for directcommunication, based on information of UE1, and transmit anRRCConnectionReconfiguration message including the configured sidelinktransmission resource to UE1. According to sidelink transmissionresource grant information included in the RRCConnectionReconfigurationmessage received in operation 623, when a sidelink resource grant modefor direct communication between UEs is determined as mode1 where the BSdirectly schedules a sidelink resource and the UE is configured torequest dynamic grant, then UE1 may transmit SL-BSR signaling to the BSto be dynamically granted with the sidelink transmission resource, inoperation 627. In operation 629, the BS may dynamically grant thesidelink resource to be used for V2X packet transmission by UE1, basedon information of SL-BSR signaling transmitted by UE1.

In an embodiment of the disclosure where UE1 and UE2 transmit andreceive a V2X packet in the unicast manner, UE1 may transmit a requestfor grant of a sidelink resource needed by UE2 to transmit an HARQfeedback with respect to the V2X packet received by UE2. UE1 maytransmit to the BS, information required for HARQ feedback transmissionresource grant of UE2 through the SidelinkUEInformation messagetransmitted to be granted with the sidelink resource for HARQ feedbacktransmission in operation 621. In operation 623, the BS may configurethe sidelink transmission resource for HARQ feedback transmission of UE2and transmit the RRCConnectionReconfiguration message including sidelinktransmission resource configuration information for the HARQ feedback toUE1. In operation 625, UE1 may deliver the sidelink transmissionresource configuration information for the HARQ feedback to UE2. An SLresource configuration message delivered from UE1 to UE2 in operation625 may also include sidelink transmission resource configurationinformation to be used by UE1 for V2X packet transmission. When the BSdetermines to directly schedule an HARQ feedback transmission resourceaccording to sidelink resource grant information used for the HARQfeedback, included in the RRCConnectionReconfiguration message receivedin operation 623, then UE2 may be granted with a sidelink resource to beused for HARQ feedback transmission from the BS in operation 631.

Referring to FIG. 6C, according to an embodiment of the disclosure, inoperation 641, UE1 may transmit a SidelinkUEInformation messageincluding information needed to request an SL resource necessary for V2Xpacket transmission to the BS. In operation 643, the BS may configure asidelink transmission resource to be used by UE1 for directcommunication, based on information of UE1, and transmit anRRCConnectionReconfiguration message including the configured sidelinktransmission resource to UE1. According to sidelink transmissionresource grant information included in the RRCConnectionReconfigurationmessage received in operation 643, when a sidelink resource grant modefor direct communication between UEs is determined as mode1 where the BSdirectly schedules a sidelink resource and the UE is configured torequest dynamic grant, then UE1 may transmit SL-BSR signaling to the BSto be dynamically granted with the sidelink transmission resource, inoperation 647. In operation 649, the BS may dynamically grant thesidelink resource to be used for V2X packet transmission by UE1, basedon information of SL-BSR signaling transmitted by UE1.

In an embodiment of the disclosure where UE1 and UE2 transmit andreceive a V2X packet in the unicast manner, UE1 may transmit a requestfor sidelink resource information needed by UE2 to the BS to transmit anHARQ feedback with respect to the V2X packet received by UE2. UE1 maytransmit to the BS, information required for HARQ feedback transmissionresource grant of UE2 through the SidelinkUEInformation messagetransmitted to be granted with the sidelink resource information forHARQ feedback transmission in operation 641. In operation 643, the BSmay configure the sidelink transmission resource for HARQ feedbacktransmission of UE2 and transmit the RRCConnectionReconfigurationmessage including sidelink transmission resource configurationinformation for the HARQ feedback to UE1. In operation 645, UE1 maydeliver the sidelink transmission resource configuration information forthe HARQ feedback to UE2. An SL resource configuration message deliveredfrom UE1 to UE2 in operation 645 may also include sidelink transmissionresource configuration information to be used by UE1 for V2X packettransmission. When the BS determines to directly schedule an HARQfeedback transmission resource according to sidelink resource grantinformation used for the HARQ feedback, included in theRRCConnectionReconfiguration message received in operation 643, then UE2may transmit SL-HARQ feedback request signaling to the BS to be grantedwith a sidelink resource for the HARQ feedback in operation 651. Inoperation 653, the BS may grant the sidelink resource to be used by UE2for HARQ feedback transmission to UE2 based on received SL-HARQ feedbackrequest signaling information. The SL-HARQ feedback request signalingmay include at least one of a designation identification (ID), a sourceID, a unicast session ID, or an SL configured grant ID.

In the above-described embodiment of FIGS. 6A through 6C, theSidelinkUEInformation message transmitted by the UE to request asidelink transmission resource may include at least one of the followingparameters:

at least one of use case indicator, service ID, destination ID, sourceID, group ID, unicast information, QoS indicator, UE's RAT capability,service flow ID, bearer ID, 5QI, PPPP, PPPR, or HARQ feedbackinformation; and

at least one of HARQ feedback information that is a parameter used for aBS to grant a sidelink transmission resource for HARQ feedback of an RXUE, such as UE's HARQ feedback transmission capability (e.g., HARQtiming (a time required for UE until HARQ feedback transmission afterV2X packet reception)), RF capability, or antenna capability.

SidelinkUEInformation•::=•SEQUENCE•{ 

 v2x-CommRxInterestedFreqList SL-V2X-CommFreqList, 

 p2x-CommTxType-r14 ENUMERATED•{true}, 

 v2x-CommTxResourceReq SL-V2X-CommTxFreqList, 

 carrierFreq ARFCN-Value, 

 priorityInfoListSL  PPPP_information, 

 reliabilityInfoListSL PPPR_information, 

 QoSInfoListSL 5QI_information, 

 serviceInfoListSL DST_ID,•//•service•ID,•flow•ID,•bearer•ID 

 groupInfoListSL group_information,•//group•ID 

 unicastInfoListSL unicast_information,•//unicast•session•ID 

 destinationID destination_ID, 

 sourceID source_ID, 

 sl_harqfeedbackInfo HARQ_feedback_information, 

... 

} 

In the above-described embodiment of FIGS. 6A through 6C, informationincluded in the RRCConnectionReconfiguration message used for deliveryof sidelink RAT configuration information to the UE may include at leastone of the following parameters:

at least one of Destination ID, source ID, group information, unicastsession information, sidelink V2X packet transmission resourceinformation, or sidelink HARQ feedback transmission resourceinformation.

RRCConnectionReconfiguration•message 

SL-CommRATListV2X•::= SEQUENCE••{ 

••• trafficDestination•DST_ID,•//•service•ID,•flow•ID,•bearer••ID 

 groupInfoListSL group_information,•//••group•ID 

 unicastInfoListSL unicast_information, //unicast•session•ID 

 sourceID  source_ID, 

  sl_V2X_ResourceConfigInfo SL-V2X-ConfigDedicated,••//sielink•resource•pool•(V2X•packet•or•HARQ•feedback) 

 ... 

 } 

According to an embodiment of the disclosure, sidelink resource grantinformation transmitted through RRC dedicated signaling may be as below.

 SL-V2X-ConfigDedicated•::=• SEQUENCE { 

 •••commTxResources CHOICE•{  //•for•V2X•packet 

release NULL, 

setup CHOICE•{ 

scheduled SEQUENCE•{ 

sl-V-RNTI C-RNTI, 

mac-MainConfig MAC-MainConfigSL, 

v2x-SchedulingPool SL-CommResourcePoolV2X• OPTIONAL, --•Need•ON 

mcs INTEGER•(0..31) OPTIONAL, --• Need•OR 

logicalChGroupInfoList LogicalChGroupInfoList 

}, 

ue-Selected SEQUENCE•{

v2x-CommTxPoolNormalDedicated SEQUENCE•{ 

poolToReleaseList SL-TxPoolToReleaseListV2X OPTIONAL, --•Need•ON 

poolToAddModList SL-TxPoolToAddModListV2X OPTIONAL, --•Need•ON 

v2x-CommTxPoolSensingConfig SL-CommTxPoolSensingConfigOTIONAL --•Need•ON 

} 

} 

} 

 ••} 

 •} 

According to an embodiment of the disclosure, sidelink HARQ feedbackresource grant information transmitted through RRC dedicated signalingmay be as below.

 SL-V2X-ConfigDedicated•::=• SEQUENCE { 

 commTxFeedbackResourcesCHOICE•{••//for•HARQ•feedback•resource 

release NULL, 

setup CHOICE•{ 

scheduled SEQUENCE•{ 

s1-V-Feedback-RNTI• C-RNTI,•//SL•HARQ•feedback• Resource Granted UE IDv2x-SchedulingPool SL-CommResourcePoolV2X• OPTIONAL, --•Need•On 

logicalChGroupInfoList LogicalChGroupInfoList 

}, 

ue-Selected SEQUENCE•{  

v2x-CommTxPoolNormalDedicated SEQUENCE•{ 

poolToReleaseList SL-TxPoolToReleaseListV2X OPTIONAL, --•Need•On 

poolToAddModList SL-TxPoolToAddModListV2X OPTIONAL, --•Need•On 

v2x-CommTxPoolSensingConfigSL-CommTxPoolSensingConfig OPTIONAL --•Need•ON 

} 

} 

} 

 ••} 

According to an embodiment of the disclosure, the SL resourceconfiguration message used to deliver sidelink resource configurationinformation for HARQ feedback transmission between UEs may include atleast one parameter included in commTxFeedbackResources. According to anembodiment of the disclosure, the SL resource configuration message mayinclude at least one parameter included in commTxResources.

When the UE is not located in a BS coverage, the UE may select an HARQfeedback transmission resource from a pre-configured resource. Thepre-configured resource may be a pre-configured resource for the HARQfeedback or for the sidelink V2X packet and the HARQ packet.

In FIGS. 6A through 6C, an SR resource for SL-BSR may have aconfiguration that is different from a resource for transmitting anuplink BSR. SR resource configuration information for transmittingSL-BSR may include at least one of SR resource ID, SR ID, Periodicity,offset, or PUCCH resource ID. The SR resource configuration informationfor transmitting SL-BSR may be differently managed according to serviceinformation of a sidelink V2X packet, QoS information, or priorityinformation. The SR resource configuration information may be usedmapped to an SL logical channel that may have a mapped QoS or priority.

According to an embodiment of the disclosure, a configuration of the SLlogical channel may be as below.

.... ........ SLLogicalChannelConfig•::=••••SEQUENCE•{ 

••••sl-SpecificParameters•••••••••SEQUENCE•{ 

••••••••priority••••••••••••••••INTEGER•(1..16), 

••••••••prioritisedBitRate••••••ENUMERATED•{kBps0,•kBps8,•kBps16,•kBps32,•kBps64,•kBps128,•kBps256,•kBps512,•kBps1024,•kBps2048,•kBps4096,•kBps8192,•kBps16384,•kBps32768,•kBps65536,•infinity}, 

••••••••bucketSizeDuration•••ENUMERATED•{ms5,•ms10,•ms20,•ms50,•ms100,•ms150,•ms300,•ms500,•ms1000,•spare7,•spare6,•spare5,•spare4,•spare3,spare2,•spare1},□ 

••••••••allowedServingCells••SEQUENCE•(SIZE•(1..maxNrofServingCells-1))•OF•ServCellIndex•••••••OPTIONAL,••••--•PDCP-CADuplication 

••••••••allowedSCS-List••SEQUENCE•(SIZE•(1..maxSCSs))•OF•SubcarrierSpacing•••••OPTIONAL,•••--•Need•R 

••••••••maxPUSCH-Duration•••••ENUMERATED•{•ms0p02,•ms0p04,•ms0p0625,•ms0p125,•ms0p25,•ms0p5,•spare2,•spare1•}•••••••••••••••••••••••••••••••••••••••OPTIONAL,•••--•Need•R 

•••••••••configuredGrantType1Allowed••ENUMERATED•[true}•••••••••••••••••••OPTIONAL,•••--•Need•R 

••••••••logicalChannelGroup•INTEGER•(0..maxLCG-ID)••••••••••••••••••••••OPTIONAL,••Need•R

••••••••schedulingRequestID•SchedulingRequestId•••••••••••••••••••••••••OPTIONAL,•••--•Need•R 

••••••••logicalChannelSR-Mask•••••••••••••••BOOLEAN, 

••••••••logicalChannelSR-DelayTimerApplied••BOOLEAN, 

••••••••..., 

••••••••bitRateQueryProhibitTimer•••••••ENUMERATED•{•s0,•s0dot4,•s0dot8,•s1dot6,•s3,•s6,•s12,s30}•••••••••••••••••••••••OPTIONAL••••--•Need•R 

••••}••OPTIONAL,•••--•Cond•SL 

•••••... 

} 

FIGS. 6D and 6E illustrate a procedure using UEAssistancelnformationsignaling exchange according to various embodiments of the disclosure.

Referring to FIGS. 6D and 6E, in case that the UE transmits aUEAssistancelnformation message to the BS to request sidelink (SL)resources (including a V2X packet and an HARQ feedback), this case mayinclude a case where the UE receives a System information message (e.g.,sibTypeV2X) including information indicating that the BS supports a V2Xsidelink function. In an embodiment of FIGS. 6A through 6C, it may beassumed that UE1 is a TX UE and UE2 is an RX UE. When unicast-based V2Xpacket transmission/reception is performed, the RX UE may transmit anHARQ feedback with respect to a V2X packet.

Referring to FIG. 6D, according to an embodiment of the disclosure, inoperation 661, UE1 may transmit a UEAssistancelnformation messageincluding information necessary for sidelink V2X packet transmissionresource grant to the BS. A request for a sidelink transmission resourcebased on the UEAssistancelnformation message may be used when the UE isgranted with a sidelink transmission resource (a V2X packet or an HARQfeedback) by using at least one of SPS, Configured Grant Type 1, orConfigured Grant Type 2). In operation 663, the BS may configure asidelink transmission resource or SL resource to be used by UE1 fordirect communication, based on information of UE1, and transmit anRRCConnectionReconfiguration message including resource grantinformation to UE1. The RRCConnectionReconfiguration message may includeat least one of SPS-based resource grant information, Configured GrantType 1-based resource grant information, or Configured Grant Type2-based resource grant information. In operation 665, the BS may grant asidelink transmission resource for V2X packet transmission of UE1. Thesidelink transmission resource granted in operation 665 may support SPS,Configured Grant Type 1-based, or Configured Grant Type 2-based packettransmission.

In an embodiment of the disclosure where UE1 and UE2 transmit andreceive a V2X packet in the unicast manner, UE2 may transmit an HARQfeedback with respect to the V2X packet transmitted by UE1. In operation667, to be granted with a sidelink resource for HARQ feedbacktransmission, UE2 may transmit a UEAssistancelnformation messageincluding information needed for HARQ feedback transmission resourcegrant to the BS. A request for a sidelink HARQ feedback transmissionresource based on the UEAssistancelnformation message may be used forHARQ feedback transmission with respect to V2X packettransmission/reception using at least one of SPS, Configured Grant Type1, or Configured Grant Type 2. In operation 669, the BS may configure asidelink transmission resource to be used by UE2 for HARQ feedbacktransmission, based on information of UE2, and transmit anRRCConnectionReconfiguration message including the configured sidelinktransmission resource to UE2. When the BS determines to directlyschedule an HARQ feedback transmission resource according to sidelinkresource grant information used for the HARQ feedback, included in theRRCConnectionReconfiguration message received in operation 669, then UE2may be granted with a sidelink resource to be used for HARQ feedbacktransmission from the BS in operation 671.

Referring to FIG. 6E, according to an embodiment of the disclosure, inoperation 681, UE1 may transmit a UEAssistancelnformation messageincluding information necessary for sidelink V2X packet transmissionresource grant to the BS. A request for a sidelink transmission resourcebased on the UEAssistancelnformation message may be used when the UE isgranted with a sidelink transmission resource (a V2X packet or an HARQfeedback) by using at least one of SPS, Configured Grant Type 1, orConfigured Grant Type 2). In operation 683, the BS may configure asidelink transmission resource or SL resource to be used by UE1 fordirect communication, based on information of UE1, and transmit anRRCConnectionReconfiguration message including resource grantinformation to UE1. The RRCConnectionReconfiguration message may includeat least one of SPS-based resource grant information, Configured GrantType 1-based resource grant information, or Configured Grant Type2-based resource grant information. In operation 687, the BS may grant asidelink transmission resource for V2X packet transmission of UE1. Thesidelink transmission resource granted in operation 687 may support SPS,Configured Grant Type 1-based, or Configured Grant Type 2-based packettransmission.

In an embodiment of the disclosure where UE1 and UE2 transmit andreceive a V2X packet in the unicast manner, UE1 may transmit a requestfor grant of a sidelink resource needed by UE2 to transmit an HARQfeedback with respect to the V2X packet received by UE2. UE1 maytransmit to the BS, information required for HARQ feedback transmissionresource grant of UE2 through the UEAssistancelnformation messagetransmitted to be granted with the sidelink resource for HARQ feedbacktransmission in operation 681. A request for a sidelink HARQ feedbacktransmission resource based on the UEAssistancelnformation message maybe used for V2X packet transmission/reception using at least one of SPS,Configured Grant Type 1, or Configured Grant Type 2. In operation 683,the BS may configure the sidelink transmission resource for HARQfeedback transmission of UE2 and transmit theRRCConnectionReconfiguration message including sidelink transmissionresource configuration information for the HARQ feedback to UE1. Inoperation 685, UE1 may deliver the sidelink transmission resourceconfiguration information for the HARQ feedback to UE2. An SL resourceconfiguration message delivered in operation 685 may also includesidelink transmission resource configuration information to be used byUE1 for V2X packet transmission. When the BS determines to directlyschedule an HARQ feedback transmission resource according to sidelinkresource grant information used for the HARQ feedback, included in theRRCConnectionReconfiguration message received in operation 683, then UE2may be granted with a sidelink resource to be used for HARQ feedbacktransmission from the BS in operation 689.

In another embodiment of the disclosure, to request a HARQ feedbacktransmission resource for a V2X packet transmitted based on SPS,Configured Grant Type 1, or Configured Grant Type 2, UE2 may transmitSL-HARQ feedback request grant signaling to the BS. SL-HARQ feedbackrequest grant signaling may include at least one of destination ID,source ID, or sidelink configured grant ID (used as an identifier foridentifying SPS, Configured Grant Type 1, or Configured Grant Type 2).

In an embodiment of FIGS. 6D through 6E, the UEAssistancelnformationmessage used for V2X sidelink packet transmission resource or sidelinkHARQ feedback transmission resource grant may include at least one ofthe following parameters:

at least one of use case indicator, service ID, destination ID, groupID, unicast information, QoS indicator, UE's RAT capability, serviceflow ID, bearer ID, 5QI, PPPP, PPPR source ID, HARQ feedbackinformation, or traffic pattern (periodicity, message size, timingoffset); and

at least one of HARQ feedback information that is a parameter used for aBS to grant a sidelink transmission resource for HARQ feedback of an RXUE, such as UE's HARQ feedback transmission capability (e.g., HARQtiming (a time required for UE until HARQ feedback transmission afterV2X packet reception)), RF capability, or antenna capability.

UEAssistanceInformation-IEs•::= SEQUENCE•{ 

•••sl-ConfigurationGrantInformationSEQUENCE•{•//•Configuation information of SPS, configured grant type 1, or configured grant typetrafficPeriodicity trafficPeriodicity,•• 

trafficDestination•DST_ID,•//•service•ID,•flow•ID,•bearer•ID 

sourceID source_ID, 

priorityInfoListSL •••••••PPPP_information,•••//PPPP•index 

reliabilityInfoListSL PPPR_information,•••//PPPR•index 

•••••QoSInfoListSL 5QI_information 

•••••groupInfoListSL group_information,•//group•ID 

unicastInfoListSL unicast_information,•//unicast•session• ID 

timingOffset INTEGER•(0..10239), 

logicalChannelIdentitySL INTEGER•(0..31), 

messageSize BIT•STRING•(SIZE•(6)), 

sl-harqfeedbackInfo sidelink_harqfeedback_information 

•••}, 

... 

} 

According to an embodiment of the disclosure, the above-describedparameter values trafficPeriodicity, cgType1IntervalSL, andcgType2IntervalSL may be as below.

sym2, sym7, sym1x14, sym2x14, sym4x14, sym5x14, sym8x14, sym10x14,sym16x14, sym20x14, sym32x14, sym40x14, sym64x14, sym80x14, sym128x14,sym160x14, sym256x14, sym320x14, sym512x14, sym640x14, sym1024x14,sym1280x14, sym2560x14, sym5120x14, sym6, sym1x12, sym2x12, sym4x12,sym5x12, sym8x12, sym10x12, sym16x12, sym20x12, sym32x12, sym40x12,sym64x12, sym80x12, sym128x12, sym160x12, sym256x12, sym320x12,sym512x12, sym640x12, sym1280x12, sym2560x12

The RRCConnectionReconfiguration message used for transmission ofSPS-based, Configured Grant type 1-based, or Configured Grant type2-based sidelink transmission resource grant information may include atleast one of the following parameters:

<Sidelink Transmission Resource Grant Information Based on ConfiguredGrant Type 1>

CGType1-ConfigSL-ToAddModList•::=•SEQUENCE•(SIZE•(1..maxConfigCGType1))•OF•CGType1-ConfigSL 

CGType1-ConfigSL-ToReleaseList•::=•SEQUENCE•(SIZE•(1..maxConfigCGType1))•OF•CGType1-ConfigIndex 

CGType1-ConfigIndex•::= INTEGER•(1..maxConfigCGType1) 

CGType1_ConfigSL•••••SEQUENCE•{ 

••cgType1-ConfigIndex CGType1-ConfgIndex, 

••timeDomainOffset••••••••••••INTEGER•(0..5119), 

•timeDomainAllocation•••••••INTEGER••(0..15), 

••frequencyDomainAllocation•••••••••••••••BIT•STRING•(SIZE(18)), 

••mcsAndTBS••••••••••••••••••••INTEGER•(0..31), 

••frequencyHoppingOffset••••INTEGER•(1..•maxNrofPhysicalResourceBlocks-1)•••••••••••OPTIONAL,•••--•Need•R 

••pathlossReferenceIndex•INTEGER•(0..maxNrofPUSCH-PathlossReferenceRSs-1), 

••cgType1IntervalSL CGType1IntervalSL, 

••-•harqFeedback•HARQFeedbackConfig, 

•••... 

} 

CGType1-ConfigIndex•::=INTEGER•(1..maxConfigCGType1) 

<Sidelink Transmission Resource Grant Information Based on ConfiguredGrant Type 2 or SPS>

 CGType2-Config•::= SEQUENCE•{ 

 ••sl-CGType2-V-RNTI C-RNTI•OPTIONAL,  --•Need•OR 

 ••cgType2-ConfigSL-ToAddModList CGType2-ConfigSL-ToAddModListOPTIONAL,•  --•Need•ON 

 ••cgType2-ConfigSL-ToReleaseList CGType2-ConfigSL-ToReleaseLisOPTIONAL•  --•Need•ON 

 } 

 CGType2-ConfigSL-ToAddModList•::=•SEQUENCE•(SIZE•(1..maxConfigCGType2))•OF•CGType2-ConfigSL 

 CGType2-ConfigSL-ToReleaseList•::=•SEQUENCE•(SIZE•(1..maxConfigCGType2))•OF•CGType2-ConfigIndex 

 CGType2-ConfigSL•::= SEQUENCE•{ 

 cgType2-ConfigIndex CGType2-ConfigIndex, 

 cgType2IntervalSL CGType2IntervalSL, 

 harqFeedback HARQFeedbackConfig, 

 } 

 •CGType2-ConfigIndex•::= INTEGER•(1..maxConfigCGType2) 

HARQ feedback resource grant information for V2X sidelink packettransmission based on SPS, Configured Grant type 1, or Configured Granttype 2 may include at least one of the following information:

information of commTxFeedbackResources, HARQ feedback resource pattern,start time, feedback resource period, resource time info, resourcefrequency info, HARQ feedback UE ID, MCS

Referring to various embodiments of the disclosure shown in FIGS. 7through 10, a description will be made of a case where the UE grants thesidelink transmission resource (V2X packet or HARQ feedback) withoutintervention of the BS. A case where the UE grants a sidelinktransmission resource without intervention of the BS may correspond to acase where the BS sets through the RRCConnectionReconfiguration message,a mode (mode2) in which the UE schedules sidelink V2X packettransmission resource grant or sidelink HARQ feedback transmissionresource grant, or a case where the UE determines to perform anoperation of mode2 in the embodiment of FIGS. 6A through 6E.

FIGS. 7A and 7B illustrate an example of a sidelink resource grant mode2a where the UE grants a sidelink transmission resource (V2X packet orHARQ feedback) to be used to itself, FIGS. 8A through 8D illustrate anexample of a sidelink resource grant mode 2c where the UE grants asidelink transmission resource based on a configured grant type, FIGS.9A and 9B illustrate an example of a sidelink resource grant mode 2dwhere the UE grants a sidelink transmission resource of another UE, andFIG. 10 illustrates an example of a sidelink resource grant mode 2bwhere the UE assists sidelink transmission resource grant of another UE.

FIGS. 7A and 7B illustrate a signal procedure in a sidelink resourcegrant mode 2a for direct communication between UEs, according to variousembodiments of the disclosure. In an embodiment of FIGS. 7A and 7B, itmay be assumed that UE1 is a TX UE and UE2 is an RX UE.

Referring to FIG. 7A, in operation 701, a setup procedure fortransmitting/receiving a unicast-based V2X sidelink packet between UE1and UE2 may be performed. Operation 701 may be performed when UE1 andUE2 perform unicast-based V2X sidelink packet transmission/reception.When UE1 and UE2 perform broadcast-based V2X sidelink packettransmission/reception, operation 701 may not be performed. UE1 mayselect a sidelink resource to be used for V2X packet transmission, inoperation 703. UE1 may sense a sidelink resource configured by the UEfor mode 2 or mode 2a through RRC dedicated signaling or apre-configured sidelink resource and grant the sidelink resource. Inoperation 703, a sidelink transmission resource granted by UE1 mayinclude at least one of a dynamic resource grant (one shot grant), aConfigured Grant Type 1 grant, or a Configured Grant Type 2 grant. Thesidelink transmission resource granted by UE1 may support V2X serviceinformation, i.e., at least one of service ID, application ID,destination ID, source ID, QoS information, priority information,traffic pattern information, or HARQ feedback capability. The HARQfeedback capability may include at least one of UE2's HARQ timing (atime required for HARQ feedback transmission after V2X packettransmission), an RF configuration, or an antenna configuration. Whenunicast-based V2X packet transmission/reception is performed, UE1 mayshare the granted sidelink transmission resource (an SL grant or an SLresource pool) to UE2. When unicast-based V2X packettransmission/reception is performed, UE2 may transmit an HARQ feedbackwith respect to a V2X packet. UE2 may grant a sidelink resourcenecessary for HARQ feedback transmission to itself, in operation 705.UE2 may select an HARQ feedback transmission resource by considering itsHARQ feedback capability. The HARQ feedback transmission resourcegranted by UE2 may support V2X service information, i.e., at least oneof service ID, application ID, destination ID, source ID, QoSinformation, priority information, traffic pattern information, or HARQfeedback capability. UE2 may select the HARQ feedback transmissionresource corresponding to a V2X packet transmission resource granted byUE1. UE2 may share the HARQ feedback transmission resource granted inoperation 705 with UE1.

Referring to FIG. 7B, in operation 711, a setup procedure fortransmitting/receiving a unicast-based V2X sidelink packet between UE1and UE2 may be performed. Operation 711 may be performed when UE1 andUE2 perform unicast-based V2X sidelink packet transmission/reception.When UE1 and UE2 perform broadcast-based V2X sidelink packettransmission/reception, operation 711 may not be performed. UE1 mayselect a sidelink resource to be used for V2X packet transmission, inoperation 713. UE1 may sense a sidelink resource configured by the UEfor mode 2 or mode 2a through RRC dedicated signaling or apre-configured sidelink resource and grant the sidelink resource. Inoperation 713, a sidelink transmission resource granted by UE1 mayinclude at least one of a dynamic resource grant (one shot grant), aConfigured Grant Type 1 grant, or a Configured Grant Type 2 grant. Thesidelink transmission resource granted by UE1 may support V2X serviceinformation, i.e., at least one of service ID, application ID,destination ID, source ID, QoS information, priority information,traffic pattern information, or HARQ feedback capability. The HARQfeedback capability may include at least one of UE2's HARQ timing (atime required for HARQ feedback transmission after V2X packettransmission), an RF configuration, or an antenna configuration. Whenunicast-based V2X packet transmission/reception is performed, UE1 maygrant the HARQ feedback transmission resource to UE2 according to UE2'sHARQ feedback capability in operation 715. UE1 may share the grantedsidelink transmission resource (an SL grant or an SL resource pool) orHARQ feedback transmission resource with UE2 in operation 717. UE2 maytransmit an HARQ feedback by using the HARQ feedback transmissionresource granted by UE1.

In the embodiment of FIGS. 7A and 7B, information of the sidelink packettransmission resource or the sidelink HARQ feedback transmissionresource, shared between UE1 and UE2, may be as below.

The information of the sidelink packet transmission resource may includeat least one of an ue-Selected information element (IE) ofcommTxResources of RRCConnectionReconfiguration, CGType1-Config IE, orCGType2-Config IE.

The information of the sidelink HARQ feedback transmission resource mayinclude at least one of an ue-Selected IE of commTxFeedbackResources ofRRCConnectionReconfiguration, harqFeedback IE of CGType1-Config, orharqFeedback IE of CGType2-Config.

FIGS. 8A through 8D illustrate a signal procedure in a sidelink resourcegrant mode 2c for direct communication between UEs, according to variousembodiments of the disclosure;

In an embodiment of FIGS. 8A through 8D, it may be assumed that UE1 is aTX UE and UE2 is an RX UE. Although various embodiments of FIGS. 8Athrough 8D will be described based on Configured Grant Type 1configuration information, they may also be equally applied when SPS orConfigured Grant Type 2 configuration information is used. Theconfiguration information may include one or more pattern information ofSPS, Configured Grant Type 1, or Configured Grant Type 2. The patterninformation may be made based on at least one of traffic periodicity,timing offset, service ID, QoS information, priority information, or amessage size of a V2X packet using SPS, CGType1, or CGType2. The patterninformation may be managed by a BS or V2X server for each mobile networkoperator (MNO) network or automatic original equipment manufacturer(OEM) and provided to a UE. In an embodiment of the disclosure, a UE mayobtain configuration information of at least one of sidelink SPS,Configured Grant Type 1, or Configured Grant Type 2 from a BS.

Referring to FIG. 8A, in operation 801, a setup procedure fortransmitting/receiving a unicast-based V2X sidelink packet between UE1and UE2 may be performed. Operation 801 may be performed when UE1 andUE2 perform unicast-based V2X sidelink packet transmission/reception. Inoperation 803, UE1 may receive the Configured Grant Type 1 configurationinformation and obtain pattern information of CGType 1. The CGType 1pattern information of the Configured Grant type 1 configurationinformation may include information of an SL CG Type 1 configuration(CGType1_ConfigSL) IE of FIGS. 6A through 6E. In operation 805, UE1 mayselect a CGType 1 pattern based on traffic attributes of a V2X packet tobe transmitted.

When one CGType 1 pattern is configured in operation 803, the configuredCGType 1 pattern may be used. For unicast-based V2X packettransmission/reception, UE1 may determine the CGType 1 pattern based onexchange of V2X traffic pattern and HARQ feedback capability informationbetween UE1 and UE2. When one or more patterns are configured inoperation 803, UE1 may monitor a sidelink resource of each pattern andselect a pattern having the lowest congestion ratio or a congestionratio that is less than a threshold. The threshold for the congestionratio used for pattern selection may be preset for V2X service type, QoSinfo, or priority info (information configured by the BS orpre-configured information). Information about a time for performingsidelink resource monitoring of the pattern (a sensing period or asensing interval) may be information configured by the BS orpre-configured information. When UE1 and UE2 perform unicast-based V2Xpacket transmission/reception, UE1 may deliver the CGType 1 patterninformation selected in operation 805 to UE2, in operation 807. UE2 mayobtain V2X packet transmission resource grant and HARQ feedbacktransmission resource grant information from the CGType 1 patterninformation received in operation 807. In operation 811, UE2 may selecta HARQ feedback transmission resource to correspond to the CGType 1pattern selected by UE1.

According to an embodiment of the disclosure, a scheme for UE2 to selectthe HARQ feedback transmission resource in operation 811 may be asbelow.

Mapping information between the CGType 1 pattern and the HARQ feedbacktransmission resource corresponding thereto may be delivered from the BSto UE1. The mapping information may be delivered from UE1 to UE2. Themapping information may be configured as a pre-configuration parameter.The HARQ feedback transmission resource may be defined to correspond toeach Configured Grant Type 1 pattern. The mapping information mayinclude an HARQ feedback transmission resource pattern mapped to eachCGType 1 transmission resource pattern. For example, the mappinginformation may include at least one of a pattern ID, a CGType 1pattern, or an HARQ feedback pattern as below. When UEs performingunicast-based V2X packet transmission/reception are aware of a mappinginformation list between CGType 1 patterns and corresponding HARQfeedback patterns and manage the mapping information list in the form ofindices (pattern IDs), then V2X packet transmission resources forunicast packet transmission between UE1 and UE2 and HARQ feedbacktransmission resources may be exchanged as mapping information indices.

CGType1PatternSL SEQUENCE•{ 

patternID Pattern_ID,• 

cgType1Pattern CGType1_ConfigSL,•// Or •CGType1-ConfigIndex•UsedharqFeedbackPattern HARQFeedbackConfig, 

... 

} 

According to another embodiment of the disclosure, the BS may selectCGType 1 pattern information to be used by UE1 in operation 803, andgrant the selected CGType 1 pattern information to UE1 throughRRCConnectionConfiguration. UE1 may select a V2X packet transmissionresource from the CGType 1 pattern granted by the BS in operation 809.UE1 may select the V2X packet transmission resource by using a sensingprocedure.

Referring to FIG. 8B, in operation 802, a setup procedure fortransmitting/receiving a unicast-based V2X sidelink packet between UE1and UE2 may be performed. Operation 802 may be performed when UE1 andUE2 perform unicast-based V2X sidelink packet transmission/reception.UE1 may transmit a UEAssistancelnformation message or aSidelinkUEInformation message to the BS in operation 804.UEAssistancelnformation or SidelinkUEInformation may provide informationused by the BS to configure CGType 1 pattern information, and mayinclude at least one of UEAssistancelnformation or SidelinkUEInformationof FIGS. 6A through 6E. In the remaining procedure of FIG. 8B,operations 806, 808, 810, and 812 of UE1 and UE2 may be the same asthose of UE1 and UE2 in the above-described embodiment of FIG. 8A.

In another embodiment of the disclosure, a UE may obtain configurationinformation of at least one of sidelink SPS, Configured Grant Type 1, orConfigured Grant Type 2 from a pre-configured pre-configurationparameter.

Referring to FIG. 8C, in operation 831, a setup procedure fortransmitting/receiving a unicast-based V2X sidelink packet between UE1and UE2 may be performed. Operation 831 may be performed when UE1 andUE2 perform unicast-based V2X sidelink packet transmission/reception.UE1 may obtain the CGType 1 pattern configuration information from thepre-configuration parameter. A criterion for UE1 to select the CGType 1pattern information may include at least one of a service ID, QoS Info,or priority Info of a V2X packet to be transmitted by UE1, trafficpattern information, or HARQ feedback capability. In the remainingprocedure of FIG. 8C, operations 833, 835, 836, and 837 of UE1 and UE2may be the same as those of UE1 and UE2 in the above-describedembodiment of FIG. 8A.

When UEs performing unicast-based V2X packet transmission/reception areaware of a CGType 1 pattern list, an HARQ feedback pattern listcorresponding thereto, and mapping index information, the UEs may usemapping index information to indicate that the CGType 1 pattern to beused for V2X packet transmission/reception is changed.

Referring to FIG. 8D, in operation 841, a setup procedure fortransmitting/receiving a unicast-based V2X sidelink packet between UE1and UE2 may be performed. Operation 841 may be performed when UE1 andUE2 perform unicast-based V2X sidelink packet transmission/reception.Operations 843 through 847 may be the same as a procedure for exchanginga CGType 1 pattern to be used for unicast-based V2X packettransmission/reception described in FIGS. 8A through 8C andcorresponding HARQ feedback pattern. UE1 may determine to change theCGType 1 pattern to be used for unicast-based V2X packettransmission/reception with UE2, in operation 849. UE1 may transmitpattern ID information corresponding to the changed CGType 1 to UE2through SL resource configuration signaling, in operation 851. UE2 mayselect an HARQ feedback pattern corresponding to a pattern IDcorresponding to the changed CGType 1, in operation 853. The SL resourceconfiguration signaling transmitted in operation 851 may include atleast one of PC5 RRC, PC5 signaling, or PC5 MAC CE.

FIGS. 9A and 9B illustrate a signal procedure in a sidelink resourcegrant mode 2d for direct communication between UEs, according to variousembodiments of the disclosure.

FIG. 9A illustrates a procedure for selecting a scheduling UE (playing arole in grating a sidelink transmission resource to another UE),according to an embodiment of the disclosure. Referring to FIG. 9A, UE1may transmit its V2X information to a V2X server in operation 901. V2Xinformation may include at least one of V2X service ID (application ID),location info, or V2X capability (non-3GPP based V2X protocol support,RF capability, antenna capability, power capability). In operation 903,the V2X server may select a UE that is to be in charge of the schedulingUE. To select the UE as the scheduling UE, information to be obtained bythe V2X server or the BS may be as below.

UE supporting a non-3GPP-based V2X protocol (e.g., dedicated short rangecommunications (DSRC)) (UE capable of determining interference andcollision with a non-3GPP-based V2X technology and granting a resourcehaving a low possibility of interference to another UE when thenon-3GPP-based V2X technology and a sidelink resource are shared);

UE in a gNB coverage (UE capable of granting a sidelink resource for theadvanced service by supporting an NR-V2X protocol);

UE supporting a sidelink resource sensing function (UE capable ofgranting a resource of P-UE having no sidelink resource sensingfunction); and

location information (information needed to manage a sidelink resourcepool to be used by a scheduling UE, based on a zone/an area/a geonetwork).

The V2X server may perform signaling indicating that UE1 is selected asthe scheduling UE to UE1, in operation 905. Signaling for indicating thescheduling UE in operation 905 may include at least one of the followinginformation:

sidelink transmission resource to be used by the scheduling UE (a V2Xpacket or an HARQ feedback), V2X resource pool configuration, serviceID, destination ID, source ID; and

when UE1 is designated as the scheduling UE, the V2X resource poolconfiguration to be used for scheduling by UE1 may be granted as an SLpool to be used in common by all scheduling UEs or as different SL poolsfor the respective scheduling UEs.

In operation 907, UE1 selected as the scheduling UE may play a role asthe scheduling UE. To obtain capabilities of a TX UE and an RX UE thatare to use sidelink resources (V2X packet transmission and HARQ feedbacktransmission), the scheduling UE may perform a capability negotiationprocedure with the TX UE and the RX UE.

In an embodiment of FIG. 9A, a BS may be used instead of the V2X server,and signaling between UE1 and the BS may be replaced with RRC signaling.

While a description has been made with reference to FIG. 9A of anexample where the V2X server or the BS determines the scheduling UE, forunicast-based V2X packet transmission/reception, negotiation may beperformed such that one of two UEs functions as the scheduling UE.

FIG. 9B illustrates a procedure for obtaining information needed for thescheduling UE to schedule a sidelink transmission resource for anotherUE. Referring to FIG. 9B, in operation 911, a PC5 unicast connectionsetup procedure may be performed when UE2 and UE3 transmit and receive aunicast-based V2X sidelink packet. Operation 911 may be performed whenUE2 and UE3 perform unicast-based V2X sidelink packettransmission/reception. In operations 913 through 915, UE2 or UE3 mayobtain information of a scheduling UE that is to grant sidelinkresources to be used for V2X packet transmission or HARQ feedbacktransmission. The information of the scheduling UE may be obtained usingat least one of V2X signaling from the V2X server, RRC signalingtransmitted from the BS, PC5 signaling (PC5 RRC or PC5 PHY preamble)transmitted by the scheduling UE, or pre-configuration. The schedulingUE may be configured differently for each V2X service, each V2Xtransmission mode (unicast, groupcast, or broadcast), each zone ID, oreach location of UE2 or UE3. In operation 917, UE2 or UE3 may deliverV2X capability information to the scheduling UE. The V2X capabilityinformation may be delivered for each V2X service, each V2X transmissionmode, each zone ID, or each location. In operation 919, the schedulingUE may schedule the V2X packet transmission resource or the HARQfeedback transmission resource based on the V2X capability of UE2 orUE3.

In an embodiment of the disclosure shown in FIG. 9B, informationexchanged between UE2 and UE3 may include at least one ofSidelinkUEInformation or UEAssistancelnformation or information includedin RRCConnectionReconfiguration. When a CGType-based transmissionresource grant mode is used, the scheduling UE may select and grant apattern. When a CGType-based transmission resource grant mode is used,the scheduling UE may set a pattern for a UE.

FIGS. 10A and 10B illustrate a signal procedure in a sidelink resourcegrant mode 2b for direct communication between UEs, according to variousembodiments of the disclosure.

FIG. 10A illustrates a procedure for selecting an assistant UE (playinga role in assisting another UE in granting a sidelink transmissionresource), according to an embodiment of the disclosure. The assistantUE needs to have capabilities to perform at least roles described below.Capability information of the assistant UE provided below may bedelivered to the V2X server, the base station, or the scheduling UE.

The assistant UE may provide a UE to be granted with a sidelinktransmission resource with information about a sidelink transmissionresource pool from which the resource is to be selected.

The assistant UE may monitor a congestion ratio of a transmissionresource pool and provide a pool having a low congestion ratio toanother UE. The assistant UE may obtain a congestion ratio referencevalue corresponding to QoS or priority information required by a V2Xpacket.

The assistant UE may sense a transmission resource pool for a UE havingno sensing function despite needing resource grant, and provide atransmission resource pool to be used for the UE having no sensingfunction.

The assistant UE may support a V2X protocol (e.g., LTE-V2X) of aprevious version, monitor a resource pool when a sidelink transmissionpool has to be shared with the V2X protocol of the previous version,select a resource pool having a low congestion ratio, and provide theselected resource pool to another UE.

The assistant UE may monitor a resource pool by using a non-3GPP-basedV2X protocol when a sidelink transmission pool has to be shared with thenon-3GPP-based V2X protocol, select a resource pool having a lowcongestion ratio, and provide the selected resource pool to another UE.

The assistant UE may monitor a resource pool instead of another UE thatis not capable of supporting sidelink resource sensing provided in anE-UTRA system or sidelink resource sensing provided in an NGRA system,select a resource pool, and provide the selected resource pool toanother UE.

The assistant UE may have a capability to determine Configured GrantType-based sidelink resource grant or one-shot grant. The ConfiguredGrant Type-based sidelink resource grant may have a capability to selecta pattern. When CGType pattern selection is performed, apattern-specific sidelink resource congestion ratio corresponding to aQoS level required by another UE may be measured.

The assistant UE may deliver SidelinkUEInformation orUEAssistancelnformation information of another UE to the scheduling UE.

The assistant UE may have to set PC5 RRC or PC5 signaling with thescheduling UE or another UE.

The assistant UE may be a UE in a gNB coverage. (UE may be capable ofgranting a sidelink resource for the advanced service by supporting anNR-V2X protocol)

The assistant UE may be selected as the same UE as the scheduling UE ofFIGS. 9A and 9B. The assistant UE may be selected by the V2X server orthe BS based on location information (for example, an RSU UE installedaround a crosswalk may be selected). A leader of a platoon service groupmay be selected as the assistant UE.

Referring to FIG. 10A, UE1 may transmit its V2X information in operation1001. V2X information may include at least one of V2X service ID(application ID), location information, or V2X capability (non-3GPPbased V2X protocol support, RF capability, antenna capability, powercapability). In operation 1003, the V2X server may select a UE that isto be in charge of the scheduling UE. To select the UE as the assistantUE, information to be obtained by the V2X server or the BS may be thesame as the capability information. In operation 1005, the V2X servermay perform signaling indicating that UE1 is selected as the assistantUE to UE1. Signaling for indicating the assistant UE in operation 1005may include at least one of the following information:

sidelink transmission resource to be used by the assistant UE (a V2Xpacket or an HARQ feedback), V2X resource pool configuration, or V2Xservice information (service ID, destination ID, source ID)

In operation 1007, UE1 may play a role as the assistant UE. To obtaincapabilities of a TX UE and an RX UE that are to use sidelink resources(V2X packet transmission and HARQ feedback transmission), the assistantUE may perform a capability negotiation procedure with the TX UE and theRX UE. The assistant UE may perform a capability negotiation procedurewith the scheduling UE to assist scheduling of the scheduling UE.

In an embodiment of FIG. 10A, a BS may be used instead of the V2Xserver, and signaling between UE1 and the BS may be replaced with RRCsignaling.

FIG. 10B illustrates a procedure for obtaining information needed forthe assistant UE to assist sidelink transmission resource grant foranother UE.

Referring to FIG. 10B, in operation 1011, a PC5 unicast connection setupprocedure may be performed when UE2 and UE3 transmit and receive aunicast-based V2X sidelink packet. Operation 1011 may be performed whenUE2 and UE3 perform unicast-based V2X sidelink packettransmission/reception. In operations 1013 through 1015, UE2 or UE3 mayobtain information of the assistant UE that is to assist grant ofsidelink resources to be used for V2X packet transmission or HARQfeedback transmission. The information of the assistant UE may beobtained using at least one of V2X signaling from the V2X server, RRCsignaling transmitted from the BS, PC5 signaling (PC5 RRC or PC5 PHYpreamble) transmitted by the assistant UE, or pre-configuration. Theassistant UE may be configured differently for each V2X service, eachV2X transmission mode (unicast, groupcast, or broadcast), each zone ID,or each location of UE2 or UE3.

In operation 1017, UE2 or UE3 may deliver V2X capability information tothe assistant UE. The V2X capability information may be delivered foreach V2X service, each V2X transmission mode, each zone ID, or eachlocation. In operation 1019, the assistant UE may assist grant of theV2X packet transmission resource or the HARQ feedback transmissionresource by UE2 or UE3, based on the V2X capability of UE2 or UE3. Theassistant UE may obtain scheduling UE information of UE2 or UE3, and thescheduling UE may report grant of the V2X packet transmission resourceor the HARQ feedback transmission resource by UE2 or UE3. The schedulingUE information by UE2 or UE3 may be obtained in the capabilitynegotiation procedure with UE2 or UE3 or from the BS or the V2X server.In an embodiment of the disclosure shown in FIG. 10B, informationexchanged between the assistant UE and the scheduling UE, UE2, or UE3may include at least one of SidelinkUEInformation orUEAssistanceInformation or information included inRRCConnectionReconfiguration. When the assistant UE assists theCGType-based transmission resource grant, the assistant UE may selectand provide a pattern.

FIGS. 11A through 11D illustrate a signal procedure for operatingsidelink resource configuration information for direct communicationbetween UEs, according to various embodiments of the disclosure.

Referring to FIGS. 11A to 11D, when a UE moves while obtaining V2Xsidelink resource configuration information, the UE needs to identifyvalidity of the resource configuration information. For example, when aservice operated by the same automotive OEM is executed except for whenthe UE moves in a network operated by the same mobile operator, the sameresource configuration information may be used regardless of whether theUE moves between cells or BSs. In another embodiment of the disclosure,to prevent a congestion ratio of resource use, a resource may be managedto use the same resource configuration information or different resourceconfiguration information for each location (geo, area, or zone).According to various embodiments of the disclosure, a description willbe made with reference to FIGS. 11A through 11D of an example where todetermine whether the V2X sidelink resource configuration information isvalid, the UE is in an idle state, in an inactive state, in a connectedstate, or out of coverage.

FIG. 11A illustrates an example of a procedure for identifying validityof the V2X sidelink resource configuration information by the UE in theidle state or the in the inactive state.

Referring to FIG. 11A, in operation 1101, the UE may identify thevalidity of a V2X system information block(sibTypeV2X) stored in the UE,by receiving system information block (SIB) information including V2Xconfiguration validity information. sibTypeV2X may include V2X sidelinkresource configuration information available to the UE. The V2Xconfiguration validity information may include a V2XareaScope parameteror a systemInformationV2XAreaID parameter.

SIB-TypeInfo•::=••••SEQUENCE•{ 

••••type••••••••••ENUMERATED•{sibType2,•sibType3,•sibType4,•sibType5,•sibType6,•sibType7,•sibType8,•sibType9,•sibTypeV2X,•spare8,•spare7,•spare6,•spare5,•spare4,•spare3,•spare2,•spare1,...•}, 

••••valueTag•••••INTEGER•(0..31)••••OPTIONAL,•--•Cond•SIB-TYPE 

••••areaScope•••ENUMERATED•{true}•••OPTIONAL,•--•Cond•AREA-ID 

••••V2XareaScope ENUMERATED•{true} OPTIONAL,•--•Cond•V2X-AREA-ID 

} 

Cond•‘V2X-AREA-ID’•-•The•field•is•mandatory•present•if•systemInformationV2XAreaID•is•present•and•the•SIB•is•valid•within•the•area•identified•by•systemInformationV2XAreaID,•otherwise•it•is•not•present. 

The area may include at least one of an area ID, a list of Cell(s), alist of RAN area IDs, or a list of TA IDs.

In operation 1103, the UE may identify a value of a V2XareaScopeparameter and determine that sibTypeV2X of the UE is valid when thevalue of the V2XareaScope parameter is true. When the value of theV2XareaScope parameter is false, the UE may determine that sibTypeV2X isinvalid. When the UE determines that the value of the V2XareaScopeparameter is false, the UE may receive sibTypeV2X and obtain the V2Xsidelink resource configuration information in operations 1105 through1007.

According to an embodiment of the disclosure, an operation, performed bythe UE, of identifying validity of sibTypeV2X by using V2XareaScope andsystemInformationV2XAreaID may be as described below.

1> for•each•stored•version•of•a•SIB: 

2> if•the•V2XareaScope•value•of•the•stored•version•of•the•SIB•is•the•same•as•the•value•received•from•the•serving•cell: 

3> if•the•stored•SIB•has•an•area•scope•and•if•the•first•PLMN-Identity•included•in•the•PLMN-IdentityInfoList,•the•systemInformationV2XAreaID•and•the•valueTag•that•are•included•in•the•SIB1•received•from•the•serving•cell•are•identical•to•the•PLMN-Identity,•the•systemInformationV2XAreaID•and•the•valueTag•associated•with•the•stored•version•of•that•SIB;•or 

3> if•the•stored•SIB•is•cell•specific•and•if•valueTag•and•CellIdentity•included•in•the•SIB1•received•from•the•serving•cell•is•identical•to•the•valueTag•and•CellIdentity•associated•with•stored•version•of•that•SIB; 

4>•consider•the•stored•SIB•as•valid•for•the•cell; 

FIG. 11B illustrates an example of a procedure for identifying validityof the V2X sidelink resource configuration information by the UE in theconnected state.

Referring to FIG. 11B, in operation 1111, the UE may receive a parameterindicating validity of V2X sidelink resource configuration informationbeing used in a serving cell through a HO-CMD message indicating ahandover to a target cell. Identification of the validity of the V2Xsidelink resource configuration information may use a signalingprocedure between a serving cell and a target cell in operation 1113. Inoperation 1115, a parameter used to identify the validity of the V2Xsidelink resource configuration information through the HO-CMD messagemay include a 1-bit V2X configuration validity indicator or a V2Xconfiguration validity indication bitmap. When the V2X configurationvalidity indicator is set to 1, the UE may determine that the V2Xsidelink resource configuration information being used in the servingcell is available to the target cell. The V2X configuration validityindication bitmap may be used to identify the validity of each ofseveral V2X sidelink resource configuration parameters. When the V2Xconfiguration validity indication bitmap is set to 1, the UE maydetermine that the V2X sidelink resource configuration parameter beingused in the serving cell is available to the target cell. When the V2Xconfiguration validity indicator or a bit value of the V2X configurationvalidity indication is set to 0, the UE may obtain again the V2Xsidelink resource configuration information or resource configurationparameter from the target cell. The V2X sidelink resource configurationinformation or parameter determined to be invalid may be obtainedthrough RRC dedicated signaling received from the target cell as inoperations 1117 and 1119.

FIG. 11C illustrates another example of a procedure for identifyingvalidity of the V2X sidelink resource configuration information by theUE in the connected state.

Referring to FIG. 11C, in operation 1121, the UE may receive a parameterindicating validity of V2X sidelink resource configuration informationbeing used in a serving cell through a HO-CMD message indicating ahandover to a target cell. Identification of the validity of the V2Xsidelink resource configuration information may use a signalingprocedure between a serving cell and a target cell in operation 1123. Inoperation 1125, a parameter used by the UE to determine the validity ofthe V2X sidelink resource configuration information in the HO-CMDmessage may include dedicatedSIB.

According to an embodiment of the disclosure, dedicatedSIB parameterinformation included in the HO-CMD message may be as below.

dedicatedSIB1-Delivery OCTET STRING (CONTAINING SIB1) OPTIONAL, -Need N

dedicatedSystemInformationDelivery OCTET STRING (CONTAININGSystemInformation)

When dedicatedSIB sibTypeV2X is included in the HO-CMD message, the UEmay use the V2X sidelink resource configuration information provided insibTypeV2X in the target cell.

In another example of a parameter available for identifying the validityof the V2X sidelink resource configuration information, the HO-CMDmessage may include an area ID. Area ID information may be used to usedifferent area IDs for a V2X configuration set or respective V2Xconfigurations, and when the UE determines that an area ID for a V2Xconfiguration set or each V2X configuration being used in the servingcell is changed in the target cell (i.e., the same area ID as in theserving cell is not set), the UE may obtain again V2X sidelink resourceconfiguration information provided through RRC dedicated signaling fromthe target cell.

According to an embodiment of the disclosure, an IE notifying area IDinformation with a valid V2X configuration may be as below.

 SL-V2X-UE-Config•::=•SEQUENCE•{ 

 areaIDList AreaIDList••••••OPTIONAL, --•Need•OR 

 typeTxSync SL-TypeTxSync OPTIONAL, --•Need•OR 

 v2x-SyncConfig SL-SyncConfigListNFreqV2X OPTIONAL, --•Need•OR 

 v2x-CommRxPool SL-CommRxPoolListV2X OPTIONAL, --• Need•OR 

 v2x-CommTxPoolNormal••••SL-CommTxPooIListV2X OPTIONAL, --• Need•OR 

 p2x-CommTxPoolNormal•••SL-CommTxPoolListV2X• OPTIONAL, --• Need•OR 

 v2x-CommTxPoolExceptional SL-CommResourcePoolV2X OPTIONAL,• --•Need•OR 

 v2x-ResourceSelectionConfig SL-CommTxPoolSensingConfigOPTIONAL,•--•Need••OR 

 zoneConfig SL-ZoneConfig OPTIONAL, --•Need•OR 

 offsetDFN INTEGER•(0..1000)• OPTIONAL, --•Need•OR 

 ... 

 } 

FIG. 11D illustrates an example of a procedure for identifying validityof the V2X sidelink resource configuration information by the UE out ofa coverage.

Referring to FIG. 11D, out of the coverage, the UE may perform V2Xpacket transmission/reception by using pre-configured V2X sidelinkresource configuration information. An example of a scenario to identifythe validity of the pre-configured V2X sidelink resource configurationinformation may be as below. The V2X service may be used at 5.9 GHz inan area A, and the V2X service may be used at 64 GHz in an area B. TheV2X configuration of 5.9 GHz and the V2X configuration of 64 GHz may beconfigured differently. When the UE moves between zones corresponding tothe area A, the 5.9 GHz V2X configuration corresponding to the area Amay be maintained. When the UE moves between zones corresponding to thearea B, the 64 GHz V2X configuration corresponding to the area B may bemaintained.

Referring to FIG. 11D, in operation 1131, The UE may calculate a zone IDfor a zone where the UE is currently located. The zone ID of the UE maybe calculated as follows:

x1=Floor(x/L)Mod Nx;

y1=Floor(y/W)Mod Ny;

Zone_id=y1*Nx+x1.

In operation 1133, the UE may determine whether the zone ID is includedin the area ID being used. The zone ID and area ID information mappedthereto may be provided through a pre-configured pre-configurationparameter. When the UE determines that the current zone ID is notincluded in the area ID being used, the UE may obtain and use apre-configuration parameter corresponding to the changed area ID, inoperation 1135.

According to an embodiment of the disclosure, pre-configured V2Xsidelink resource configuration information and information indicatingvalidity of the resource configuration information, i.e., a zone ID andarea ID information mapped thereto may be as below.

SL-V2X-PreconfigFreqInfo•::= SEQUENCE•{ 

v2x-CommPreconfigGeneral• SL-PreconfigGeneral, 

v2x-CommPreconfigSync SL-PreconfigV2X-Sync OPTIONAL, 

v2x-CommRxPoolList SL-PreconfigV2X-RxPoolList, 

v2x-CommTxPoolList SL-PreconfigV2X-TxPoolList, 

p2x-ComTxPoolList SL-PreconfigV2X-TxPoolList, 

v2x-ResourceSelectionConfig •SL-CommTxPoolSensingConfig• OPTIONAL, 

zoneConfig SL-ZoneConfig OPTIONAL,• 

v2x-AreaList SL-AreaList OPTIONAL, 

syncPriority ENUMERATED•{gnss,••gnb,•enb}, 

thresSL-TxPrioritization SL-Priority OPTIONAL, 

offsetDFN INTEGER•(0..1000)•OPTIONAL, 

... 

} 

SL-AreaList•::=•SEQUENCE•] 

v2x-AreaID SL-AreaID, 

•••••v2x-ZoneIDList SL-ZoneIDList, 

}

An apparatus and method according to various embodiments of thedisclosure may provide a method of supporting a vehicle communicationservice requiring various QoSs in a vehicle communication system bygranting sidelink resources to be used for direct communication betweenUEs, thereby achieving required values for reliability and low-latencyin vehicle communication.

In addition, effects obtainable in the disclosure are not limited to theeffects as described above, and other effects not described above willbecome apparent to those skilled in the art from the following detaileddescription.

While the disclosure has been shown and described with reference tovarious embodiments thereof, it will be understood by those skilled inthe art that various changes in form and details may be made thereinwithout departing the spirit and scope of the disclosure as defined bythe appended claims and their equivalents.

What is claimed is:
 1. A method, performed by a user equipment (UE), ofperforming sidelink communication, the method comprising: obtaining avalid system information block (SIB) for sidelink communication;autonomously determining a sidelink resource based on information of apool of sidelink resources included in the valid SIB for sidelinkcommunication; and performing sidelink communication with another UEusing the determined sidelink resource.
 2. The method of claim 1,wherein the UE and the other UE are inside a coverage of a base station.3. The method of claim 1, further comprising: receiving a SIB includinginformation for determining a validity of the SIB for sidelinkcommunication from a base station; and determining a validity of astored SIB for sidelink communication based on the information fordetermining a validity of the SIB for sidelink communication.
 4. Themethod of claim 3, wherein the obtaining of the valid SIB for sidelinkcommunication comprises considering the stored SIB for sidelinkcommunication as the valid SIB for sidelink communication when thestored SIB for sidelink communication is determined to be valid.
 5. Themethod of claim 3, wherein the obtaining of the valid SIB for sidelinkcommunication comprises receiving the valid SIB for sidelinkcommunication when the stored SIB for sidelink communication isdetermined to be invalid.
 6. The method of claim 3, wherein theinformation for determining the validity of the SIB for sidelinkcommunication comprises information of an area scope of a SIB forsidelink communication and system information area identification (ID)for a serving cell.
 7. The method of claim 1, further comprising:receiving information of a pool of sidelink resources from a basestation by radio resource control (RRC) dedicated signaling; andautonomously determining the sidelink resource based on the informationof the pool of the sidelink resources received by the RRC dedicatedsignaling.
 8. The method of claim 1, further comprising autonomouslydetermining the sidelink resource based on information of apreconfigured pool of sidelink resources.
 9. A user equipment (UE) forperforming sidelink communication, the UE comprising: a transceiver; andat least one processor coupled with the transceiver and configured to:obtain a valid system information block (SIB) for sidelinkcommunication, autonomously determine a sidelink resource based oninformation of a pool of sidelink resources included in the valid SIBfor sidelink communication, and perform sidelink communication withanother UE using the determined sidelink resource.
 10. The UE of claim9, wherein the UE and the other UE are inside a coverage of a basestation.
 11. The UE of claim 9, wherein the at least one processor isfurther configured to: receive a SIB including information fordetermining a validity of the SIB for sidelink communication from a basestation, and determine a validity of a stored SIB for sidelinkcommunication based on the information for determining a validity of theSIB for sidelink communication.
 12. The UE of claim 11, wherein the atleast one processor is further configured to consider the stored SIB forsidelink communication as the valid SIB for sidelink communication whenthe stored SIB for sidelink communication is determined to be valid. 13.The UE of claim 11, wherein the at least one processor is furtherconfigured to receive the valid SIB for sidelink communication when thestored SIB for sidelink communication is determined to be invalid. 14.The UE of claim 11, wherein the information for determining the validityof the SIB for sidelink communication comprises information of an areascope of a SIB for sidelink communication and system information areaidentification (ID) for a serving cell.
 15. The UE of claim 9, whereinthe at least one processor is further configured to: receive informationof a pool of sidelink resources from a base station by radio resourcecontrol (RRC) dedicated signaling, and autonomously determine thesidelink resource based on the information of the pool of the sidelinkresources received by the RRC dedicated signaling.
 16. The UE of claim9, wherein the at least one processor is further configured toautonomously determine the sidelink resource based on information of apreconfigured pool of sidelink resources.